For a given dry bulb temperature, as the relative humidity __________ the wet bulb temperature will increase.
The pressure at the outlet of a refrigerant compressor is called
The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called
The inclined and non-uniformly spaced straight lines on a psychrometric chart indicates wet bulb temperature.
The drier in a refrigeration system removes moisture in the system.
The air cooling system mostly used in transport type aircrafts is
The lowest thermal diffusivity is of
A simple air cooling system is good for __________ flight speeds.
The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h0).
A low wet bulb temperature indicates very __________ humidity.
The highest temperature during the cycle in a vapour compression system occurs after evaporation.
The heat transfer by conduction through a thick cylinder(Q) is given by (where T1 = Higher temperature, T2 = Lower temperature, r1 = Inside radius, r2 = Outside radius, l = Length of cylinder, and k = Thermal conductivity)
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called
The mass of water vapour present in 1 kg of dry air, is called humidity ratio.
The final relative humidity of the air during cooling and dehumidification is generally __________ than that of entering air.
Air refrigerator works on
Dry bulb temperature is the temperature of air recorded by a thermometer, when
The wet bulb depression indicates __________ humidity of the air.
The transfer of heat by molecular collision is smallest in
During dehumidification process, the relative humidity
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
R-is generally preferred over R-in deep freezers since
The emissivity of a polished silver body is __________ as compared to black body.
The reciprocating refrigerant compressors are very suitable for
In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is
The refrigerant widely used in domestic refrigerators is
The critical temperature is the temperature
The space between the two walls of a thermos flask is evacuated because vacuum is a __________ conductor of heat.
The unit of overall coefficient of heat transfer is
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